DavidJCobb

JavaScript event bubbling example

When JavaScript fires an event, like click, it doesn't just fire it on the event target (i.e. the thing that was clicked). It also fires the event on every ancestor element. This means that an event listener on an ancestor can handle clicks on any of its children.

The code below demonstrates this with a list, where we want to react to the user clicking any list item, and we want our reaction to take into account which list item they clicked. We use a listener on the entire list, and just check e.target to see what list item was clicked.

DavidJCobb

The as_const function returns a Proxy wrapping the passed-in argument. This proxy attempts to prevent all modifications to the underlying object. The difference between this and using Object.freeze is that the latter makes the object itself immutable, while as_const simply prevents direct changes to the object via a specific reference to the object. Additionally, as_const prevents changes to any object that is referenced through the proxy (i.e. as_const(foo).bar.data = 5 is equivalent to as_const(foo.bar).data = 5 and will throw an exception).

In C++ terms, Object.freeze is akin to instantiating a const Object, whereas the result of as_const is a const Object& and the original object can still be modified elsewhere.

This idea is leaky enough that I would recommend against using it. If you need functionality like this, prefer a language that offers it reliably as a built-in feature.

DavidJCobb

//
// This file contains a JavaScript tag function to let you 
// define regexes without needing to backslash-escape every 
// forward slash in the regex text; good for URLs.
//

function regex(tag) {
   return new RegExp(tag.raw, "i");
}

DavidJCobb

// given:
QPlainTextEdit* widget;
int maxlength;

auto* doc = widget->document();
assert(doc);
QObject::connect(doc, &QTextDocument::contentsChange, this, [maxlength, widget](int pos, int removed, int added) {
   if (added - removed <= 0)
      return;
   if (maxlength < 0)

DavidJCobb

--
-- This two-file add-on will track your position every tenth of a second 
-- (or thirtieth when mounted, if I got the update re-registration right) 
-- and maintain a grid of where you've been. Every fifth of a second, it 
-- redraws the grid using Texture controls rendered in 3D as gridlines.
--
-- ISSUES:
--
--  - Performance (see below comments)
--

DavidJCobb

Unit CobbCountPersistents;
 
Var
   giCount: Integer;
 
Function Initialize: Integer;
Var
   eFile:      IInterface;
   eWorlds:    IInterface;
   eWorld:     IInterface;

DavidJCobb

;
; Make Windows notifications semitransparent, and allow the user to click through 
; all but their rightmost portion (so as to keep the close/dismiss button usable).
;
#Persistent
#SingleInstance
#NoEnv
#Warn
SendMode Input
SetWorkingDir %A_ScriptDir%